Guess who NBC tapped to play 'Peter Pan' in its December live production

The Girls actress will star in the title role of the live Sound of Music follow-up, which NBC will broadcast on Dec. 4, NBC announced Wednesday morning. She joins Christopher Walken, who was previously cast as Captain Hook.

Allison Williams arrives at The Television Academy presents An Evening with "Girls" on Thursday, March 13, 2014 in Los Angeles. (Photo by Matt Sayles/Invision/AP)

"Allison Williams is a major find," said executive producers CraigZadan and Neil Meron. "She will reinvent the iconic role of Peter Pan with her wit, her warmth, her dynamic flying and her wonderful musical abilities. The score will be sung beautifully and introduced to a whole new generation of families."